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[project @ 1997-04-24 09:48:59 by jwe]
author jwe
date Thu, 24 Apr 1997 09:51:05 +0000
parents
children e6d25bc478dd
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2881:b99a6a2619aa 2882:05926e1b367d
1 /*
2
3 Copyright (C) 1996, 1997 John W. Eaton
4
5 This file is part of Octave.
6
7 Octave is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
10 later version.
11
12 Octave is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with Octave; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20
21 */
22
23 #if defined (__GNUG__)
24 #pragma implementation
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include <config.h>
29 #endif
30
31 #include <iostream.h>
32
33 #include "lo-utils.h"
34
35 #include "defun.h"
36 #include "error.h"
37 #include "help.h"
38 #include "ov-list.h"
39 #include "unwind-prot.h"
40
41 octave_allocator
42 octave_list::allocator (sizeof (octave_list));
43
44 int
45 octave_list::t_id (-1);
46
47 const string
48 octave_list::t_name ("list");
49
50 octave_value
51 octave_list::index (const octave_value_list& idx) const
52 {
53 octave_value retval;
54
55 if (idx.length () == 1)
56 {
57 double d = idx(0).double_value ();
58
59 if (! error_state)
60 {
61 if (D_NINT (d) == d)
62 {
63 int n = lst.length ();
64
65 int i = static_cast<int> (d);
66
67 if (i > 0 && i <= n)
68 retval = lst(i-1);
69 else
70 error ("list index = %d out of range", i);
71 }
72 else
73 error ("list index must be an integer");
74 }
75 }
76 else
77 error ("lists may only be indexed by a single scalar");
78
79 return retval;
80 }
81
82 void
83 octave_list::print (ostream& os, bool)
84 {
85 begin_unwind_frame ("octave_list_print");
86
87 unwind_protect_int (list_indent);
88
89 os.form ("\n%*s{\n", list_indent, "");
90
91 increment_list_indent ();
92
93 int n = lst.length ();
94
95 for (int i = 0; i < n; i++)
96 {
97 bool pad_after = false;
98
99 octave_value val = lst(i);
100
101 os.form ("%*s", list_indent, "");
102
103 if (val.print_as_scalar ())
104 os << " ";
105 else if (val.is_list ())
106 pad_after = true;
107 else
108 {
109 pad_after = true;
110
111 os << "\n\n";
112 }
113
114 val.print (os);
115
116 if (pad_after)
117 os << "\n";
118 }
119
120 decrement_list_indent ();
121
122 os.form ("%*s%s", list_indent, "", "}\n");
123
124 run_unwind_frame ("octave_list_print");
125 }
126
127 DEFUN (make_list, args, ,
128 "make_list (ARGS)\n\
129 \n\
130 Create a new list from ARGS.")
131 {
132 return octave_value (args);
133 }
134
135 DEFUN (append, args, ,
136 "append (LIST, ARGS)\n\
137 \n\
138 Return a new list created by appending ARGS to LIST")
139 {
140 octave_value retval;
141
142 int nargin = args.length ();
143
144 if (nargin > 1)
145 {
146 octave_value_list tmp = args(0).list_value ();
147
148 if (! error_state)
149 {
150 for (int i = 1; i < nargin; i++)
151 tmp.append (args(i));
152
153 retval = tmp;
154 }
155 }
156 else
157 print_usage ("append");
158
159 return retval;
160 }
161
162 DEFUN (reverse, args, ,
163 "reverse (LIST)\n\
164 \n\
165 Return a new list created by reversing the elements of LIST")
166 {
167 octave_value retval;
168
169 int nargin = args.length ();
170
171 if (nargin == 1)
172 {
173 octave_value_list tmp = args(0).list_value ();
174
175 if (! error_state)
176 retval = tmp.reverse ();
177 }
178 else
179 print_usage ("reverse");
180
181 return retval;
182 }
183
184 /*
185 ;;; Local Variables: ***
186 ;;; mode: C++ ***
187 ;;; End: ***
188 */